<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
</body>
<script>
  // 检测是否是数字，包括整数，小数
  let str = "test";
  let str1 = "test1";
  let reg = /[0-9]/;
  console.log(reg.test(str));
  console.log(reg.test(str1));
</script>
</html>